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kalker vs Rink: catalog facts
kalker	Rink
Free Free and open source under the MIT licence.	Free Free and open source, licensed under MPL-2.0 and GPL-3.0.
Windows, macOS, Linux, Android, Web, Command line	Windows, macOS, Linux, Web, Command line
Natural math syntax with user-defined functions and variables Handles complex numbers, vectors and matrices	Tracks units through whole calculations Dimensional analysis catches mismatched quantities
Derivatives and integrals are numerical estimates Higher-order derivatives can be inaccurate	Repository is in the middle of moving to Codeberg No prebuilt releases listed on GitHub
Downloadable app, Web application	Downloadable app, Web application
Open source	Open source
License: MIT	License: MPL-2.0 and GPL-3.0
No account needed	No account needed
Works offline	Not stated if it works offline
Official website Full listing and sources Checked October 2, 2026	Official website Full listing and sources Checked October 2, 2026

Catalog facts only. Anything “not stated” is unconfirmed. Check full listings for details.